Journal of the Society of Motion Picture Engineers ( Volume: 48, Issue: 4, April 1947)

[ACTIVE]

The Concentrated-Arc Lamp as a Source of Modulated Radiation

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The concentrated arc is a new type of lamp whose radiation emitting source is a thin film of molten zirconium and a cloud of excited and ionized zirconium vapor and argon gas which forms on and very close to the end of the specially prepared negative electrode. By modulating the lamp current, the radiation may be modulated at audio frequencies. The continuous radiation from the molten zirconium can be only partly modulated, the per cent modulation decreasing with increase in modulating frequency and in spectral wavelength. The line radiation from the cathode-glow region close to the electrode modulates almost completely at all audio frequencies. It is particularly strong in the near-ultraviolet and infrared. By using suitable modulator circuits, which are adapted to the rather unusual impedance characteristics of these lamps, and by using optical filters to select the spectral region used, the light output may be made to follow the lamp current modulation with good fidelity.
Publication Date: 1947-04-01
DOI: 10.5594/J12706
Link: https://doi.org/10.5594/J12706
Author(s): W. D. Buckingham, C. R. Deibert

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W. D. Buckingham and C. R. Deibert; The Concentrated-Arc Lamp as a Source of Modulated Radiation, Journal of the Society of Motion Picture Engineers ( Volume: 48, Issue: 4, April 1947); SMPTE, 1947. Available at https://doi.org/10.5594/J12706

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W. D. Buckingham and C. R. Deibert; The Concentrated-Arc Lamp as a Source of Modulated Radiation, Journal of the Society of Motion Picture Engineers ( Volume: 48, Issue: 4, April 1947); SMPTE, 1947. Available at https://doi.org/10.5594/J12706

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<span class="citation">W. D. Buckingham and C. R. Deibert; <cite>The Concentrated-Arc Lamp as a Source of Modulated Radiation</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 48, Issue: 4, April 1947); SMPTE, 1947. Available at <a href="https://doi.org/10.5594/J12706" target="_blank" rel="noopener">https://doi.org/10.5594/J12706</a></span>

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<li>
W. D. Buckingham and C. R. Deibert; <cite id="bib-10-5594-j12706">The Concentrated-Arc Lamp as a Source of Modulated Radiation</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 48, Issue: 4, April 1947); SMPTE, 1947
<span class="doi">10.5594/J12706</span>
</li>